1#!/bin/sh
2#
3# Copyright 2003 Wichert Akkerman <wichert@wiggy.net>
4#
5# Simple script to generate a debian/ directory for a Linux kernel.
6
7set -e
8
9is_enabled() {
10	grep -q "^$1=y" include/config/auto.conf
11}
12
13if_enabled_echo() {
14	if is_enabled "$1"; then
15		echo -n "$2"
16	elif [ $# -ge 3 ]; then
17		echo -n "$3"
18	fi
19}
20
21set_debarch() {
22	if [ -n "$KBUILD_DEBARCH" ] ; then
23		debarch="$KBUILD_DEBARCH"
24		return
25	fi
26
27	# Attempt to find the correct Debian architecture
28	case "$UTS_MACHINE" in
29	i386|ia64|alpha|m68k|riscv*)
30		debarch="$UTS_MACHINE" ;;
31	x86_64)
32		debarch=amd64 ;;
33	sparc*)
34		debarch=sparc$(if_enabled_echo CONFIG_64BIT 64) ;;
35	s390*)
36		debarch=s390x ;;
37	ppc*)
38		if is_enabled CONFIG_64BIT; then
39			debarch=ppc64$(if_enabled_echo CONFIG_CPU_LITTLE_ENDIAN el)
40		else
41			debarch=powerpc$(if_enabled_echo CONFIG_SPE spe)
42		fi
43		;;
44	parisc*)
45		debarch=hppa ;;
46	mips*)
47		if is_enabled CONFIG_CPU_LITTLE_ENDIAN; then
48			debarch=mips$(if_enabled_echo CONFIG_64BIT 64)$(if_enabled_echo CONFIG_CPU_MIPSR6 r6)el
49		elif is_enabled CONFIG_CPU_MIPSR6; then
50			debarch=mips$(if_enabled_echo CONFIG_64BIT 64)r6
51		else
52			debarch=mips
53		fi
54		;;
55	aarch64|arm64)
56		debarch=arm64 ;;
57	arm*)
58		if is_enabled CONFIG_AEABI; then
59			debarch=arm$(if_enabled_echo CONFIG_VFP hf el)
60		else
61			debarch=arm
62		fi
63		;;
64	openrisc)
65		debarch=or1k ;;
66	sh)
67		if is_enabled CONFIG_CPU_SH3; then
68			debarch=sh3$(if_enabled_echo CONFIG_CPU_BIG_ENDIAN eb)
69		elif is_enabled CONFIG_CPU_SH4; then
70			debarch=sh4$(if_enabled_echo CONFIG_CPU_BIG_ENDIAN eb)
71		fi
72		;;
73	esac
74	if [ -z "$debarch" ]; then
75		debarch=$(dpkg-architecture -qDEB_HOST_ARCH)
76		echo "" >&2
77		echo "** ** **  WARNING  ** ** **" >&2
78		echo "" >&2
79		echo "Your architecture doesn't have its equivalent" >&2
80		echo "Debian userspace architecture defined!" >&2
81		echo "Falling back to the current host architecture ($debarch)." >&2
82		echo "Please add support for $UTS_MACHINE to ${0} ..." >&2
83		echo "" >&2
84	fi
85}
86
87# Some variables and settings used throughout the script
88version=$KERNELRELEASE
89if [ -n "$KDEB_PKGVERSION" ]; then
90	packageversion=$KDEB_PKGVERSION
91	revision=${packageversion##*-}
92else
93	revision=$(cat .version 2>/dev/null||echo 1)
94	packageversion=$version-$revision
95fi
96sourcename=$KDEB_SOURCENAME
97
98if [ "$ARCH" = "um" ] ; then
99	packagename=user-mode-linux
100else
101	packagename=linux-image
102fi
103
104debarch=
105set_debarch
106
107email=${DEBEMAIL-$EMAIL}
108
109# use email string directly if it contains <email>
110if echo $email | grep -q '<.*>'; then
111	maintainer=$email
112else
113	# or construct the maintainer string
114	user=${KBUILD_BUILD_USER-$(id -nu)}
115	name=${DEBFULLNAME-$user}
116	if [ -z "$email" ]; then
117		buildhost=${KBUILD_BUILD_HOST-$(hostname -f 2>/dev/null || hostname)}
118		email="$user@$buildhost"
119	fi
120	maintainer="$name <$email>"
121fi
122
123# Try to determine distribution
124if [ -n "$KDEB_CHANGELOG_DIST" ]; then
125        distribution=$KDEB_CHANGELOG_DIST
126# In some cases lsb_release returns the codename as n/a, which breaks dpkg-parsechangelog
127elif distribution=$(lsb_release -cs 2>/dev/null) && [ -n "$distribution" ] && [ "$distribution" != "n/a" ]; then
128        : # nothing to do in this case
129else
130        distribution="unstable"
131        echo >&2 "Using default distribution of 'unstable' in the changelog"
132        echo >&2 "Install lsb-release or set \$KDEB_CHANGELOG_DIST explicitly"
133fi
134
135mkdir -p debian/source/
136echo "1.0" > debian/source/format
137
138echo $debarch > debian/arch
139extra_build_depends=", $(if_enabled_echo CONFIG_UNWINDER_ORC libelf-dev:native)"
140extra_build_depends="$extra_build_depends, $(if_enabled_echo CONFIG_SYSTEM_TRUSTED_KEYRING libssl-dev:native)"
141
142# Generate a simple changelog template
143cat <<EOF > debian/changelog
144$sourcename ($packageversion) $distribution; urgency=low
145
146  * Custom built Linux kernel.
147
148 -- $maintainer  $(date -R)
149EOF
150
151# Generate copyright file
152cat <<EOF > debian/copyright
153This is a packacked upstream version of the Linux kernel.
154
155The sources may be found at most Linux archive sites, including:
156https://www.kernel.org/pub/linux/kernel
157
158Copyright: 1991 - 2018 Linus Torvalds and others.
159
160The git repository for mainline kernel development is at:
161git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
162
163    This program is free software; you can redistribute it and/or modify
164    it under the terms of the GNU General Public License as published by
165    the Free Software Foundation; version 2 dated June, 1991.
166
167On Debian GNU/Linux systems, the complete text of the GNU General Public
168License version 2 can be found in \`/usr/share/common-licenses/GPL-2'.
169EOF
170
171# Generate a control file
172cat <<EOF > debian/control
173Source: $sourcename
174Section: kernel
175Priority: optional
176Maintainer: $maintainer
177Rules-Requires-Root: no
178Build-Depends: bc, rsync, kmod, cpio, bison, flex | flex:native $extra_build_depends
179Homepage: https://www.kernel.org/
180
181Package: $packagename-$version
182Architecture: $debarch
183Description: Linux kernel, version $version
184 This package contains the Linux kernel, modules and corresponding other
185 files, version: $version.
186
187Package: linux-libc-dev
188Section: devel
189Provides: linux-kernel-headers
190Architecture: $debarch
191Description: Linux support headers for userspace development
192 This package provides userspaces headers from the Linux kernel.  These headers
193 are used by the installed headers for GNU glibc and other system libraries.
194Multi-Arch: same
195EOF
196
197if is_enabled CONFIG_MODULES; then
198cat <<EOF >> debian/control
199
200Package: linux-headers-$version
201Architecture: $debarch
202Description: Linux kernel headers for $version on $debarch
203 This package provides kernel header files for $version on $debarch
204 .
205 This is useful for people who need to build external modules
206EOF
207fi
208
209if is_enabled CONFIG_DEBUG_INFO; then
210cat <<EOF >> debian/control
211
212Package: linux-image-$version-dbg
213Section: debug
214Architecture: $debarch
215Description: Linux kernel debugging symbols for $version
216 This package will come in handy if you need to debug the kernel. It provides
217 all the necessary debug symbols for the kernel and its modules.
218EOF
219fi
220
221cat <<EOF > debian/rules
222#!$(command -v $MAKE) -f
223
224srctree ?= .
225
226build-indep:
227build-arch:
228	\$(MAKE) KERNELRELEASE=${version} ARCH=${ARCH} \
229	KBUILD_BUILD_VERSION=${revision} -f \$(srctree)/Makefile
230
231build: build-arch
232
233binary-indep:
234binary-arch: build-arch
235	\$(MAKE) KERNELRELEASE=${version} ARCH=${ARCH} \
236	KBUILD_BUILD_VERSION=${revision} -f \$(srctree)/Makefile intdeb-pkg
237
238clean:
239	rm -rf debian/*tmp debian/files
240	\$(MAKE) clean
241
242binary: binary-arch
243EOF
244chmod +x debian/rules
245
246exit 0
247